package com.meiyou.aspect;

import com.meiyou.annotation.AutoFill;
import com.meiyou.constant.AutoFillConstant;
import com.meiyou.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @BelongsProject: sky-take-out
 * @BelongsPackage: com.sky.aspect
 * @Author: 严明
 * @Date: 2023/8/30 16:07
 * @Description: todo
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.meiyou.mapper.*.*(..)) && @annotation(com.meiyou.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * 前置通知，在通知中进行公共字段的赋值
     *
     * @param joinPoint
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        //  获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //  获取当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) return;

        Object entity = args[0];

        //  准备赋值的数据
        LocalDateTime now = LocalDateTime.now();

        // 根据当前不同的操作类型，为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            try {

                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);

                // 通过反射为对象属性赋值
                setCreateTime.invoke(entity, now);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);

                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);

                // 通过反射为对象属性赋值
                setUpdateTime.invoke(entity, now);
                setCreateTime.invoke(entity, now);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
